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Rollup merge of #91298 - FabianWolff:issue-91028-source-avail, r=cjgillot

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Improve error message for `E0659` if the source is not available

Fixes #91028. The fix is similar to those in #89233 and #87088. With this change, instead of the dangling
```
note: `Option` could also refer to the enum defined here
```
I get
```
note: `Option` could also refer to an enum from prelude
```
If the standard library source code _is_ available, the output does not change.
This commit is contained in:
Matthias Krüger 2021-12-01 10:50:21 +01:00 committed by GitHub
commit c09c16c0df
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1 changed files with 1 additions and 1 deletions
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compiler/rustc_resolve/src/diagnostics.rs
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@ -1178,7 +1178,7 @@ impl<'a> Resolver<'a> {
fn binding_description(&self, b: &NameBinding<'_>, ident: Ident, from_prelude: bool) -> String {
let res = b.res();
if b.span.is_dummy() {
if b.span.is_dummy() || self.session.source_map().span_to_snippet(b.span).is_err() {
// These already contain the "built-in" prefix or look bad with it.
let add_built_in =
!matches!(b.res(), Res::NonMacroAttr(..) | Res::PrimTy(..) | Res::ToolMod);